borderline significanceP = .06
Both MPNSTs with methylated and unmethylated RASSF1A promoter had lower expression than the benign neurofibromas ( P = .0001 and P = .05, respectively), suggesting that additional mechanisms are involved in silencing the RASSF1A gene in MPNST. For the MPNSTs, a borderline significance was seen with the second assay, between promoter hypermethylation and reduced gene expression ( P = .06; data not shown).